Credit Quality (Summary of the Credit Risk Profile of the Bancorp's Residential Mortgage and Consumer Portfolio Segments by Class) (Detail) - USD ($) $ in Millions		Dec. 31, 2017		Dec. 31, 2016
Total loans and leases		$ 91,833	[1]	$ 91,955	[2]
Home Equity | Consumer Portfolio Segment
Total loans and leases		7,014		7,695
Automobile Loans | Consumer Portfolio Segment
Total loans and leases		9,112		9,983
Credit Card | Consumer Portfolio Segment
Total loans and leases		2,299		2,237
Other Consumer Loans and Leases | Consumer Portfolio Segment
Total loans and leases		1,559		680
Performing Financing Receivable
Total loans and leases	[3]	35,307		35,366
Performing Financing Receivable | Residential Mortgage | Residential Portfolio Segment
Total loans and leases	[3]	15,424		14,874
Performing Financing Receivable | Home Equity | Consumer Portfolio Segment
Total loans and leases		6,940		7,622
Performing Financing Receivable | Automobile Loans | Consumer Portfolio Segment
Total loans and leases		9,111		9,981
Performing Financing Receivable | Credit Card | Consumer Portfolio Segment
Total loans and leases		2,273		2,209
Performing Financing Receivable | Other Consumer Loans and Leases | Consumer Portfolio Segment
Total loans and leases		1,559		680
Nonperforming Financing Receivable
Total loans and leases	[3]	131		137
Nonperforming Financing Receivable | Residential Mortgage | Residential Portfolio Segment
Total loans and leases	[3]	30		34
Nonperforming Financing Receivable | Home Equity | Consumer Portfolio Segment
Total loans and leases		74		73
Nonperforming Financing Receivable | Automobile Loans | Consumer Portfolio Segment
Total loans and leases		1		2
Nonperforming Financing Receivable | Credit Card | Consumer Portfolio Segment
Total loans and leases		26		28
Nonperforming Financing Receivable | Other Consumer Loans and Leases | Consumer Portfolio Segment
Total loans and leases		$ 0		$ 0

[1] Excludes $ 137 of residential mortgage loans measured at fair value at December 31, 2017 .

[2] Excludes $ 143 of residential mortgage loans measured at fair value at December 31, 2016 .

[3] (a) Excludes $ 137 and $ 143 of residential mortgage loans measured at fair value at December 31, 2017 and 2016 , respectively